Rotatable planter support unit



FIG. 1 is a perspective view of the rotatable planter support unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a rotatable planter support unit, substantially as shown. 